Machine foe dkessing and polishing stone



UNITED STATES PATENT OFFIOE.

DAVID HINMAN, OF BEREA, OHIO.

MACHINE FOR DRESSING AND' POLISHING- STONE.

Specification of Letters Patent No. 16,545, dated February 3, 1857.

.To all whom it may con cera:

Be it known that I, DAVID HINMAN, of Berea, in the county of Cuyahoga and State of Ohio, have invented an Improved Machine for Dressing and Polishing Stone; and I do hereby declare that t-he following is a full and exact description of the same, reference being had to the accompanying drawings and to the letters of reference marked thereon.

My invention relates to an improvement in machines for dressing or polishing stone, &c.

Figure l is a side view of my improved machine for dressing and polishing stone. Fig. 2, a front view. Fig. 3 a plan view, and

Y Fig. 4 a detached section enlarged.

Like letters represent like parts in the different views.

A, A', represent the disks, B, and B the hollow shafts upon the ends of which the disks A, A are secured. C, C', the tubes, through which, sand and water pass into the hollow shafts B, B. D, a sliding carriage, wlch moves upon the way E, E', and which supports the hollow shaft B, and to which the tube O, is secured. F, F, the stationary frame which supports the hollow shaft B, and to which the tube O is secure. G, a lever secured to the stationary frame or way E, upon which the carriage D slides.

g, is a brace or rod secured to the lever G, and at right angles to it, and also secured to the sliding` carriage D.

I and J, are two pulleys around which pass the belts I, and J, which belts also pass around the pulleys K, K. The belt I, is a cross belt, as seen in Fig. 2, so that the pulley I is turned in a direction opposite to that in which the pulley J is turned. The pulleys K, K, are secured to the shaft L, around which the belt M, passes, which belt also passes around the pulley N, on the standard O. To the shaft of the pulley N, is attached the crank P, and t-o this crank is attached the rod 13, to which rod, the stone R, to be dressed or polished is secured, in any suitable manner.

I`G\is a rod, attached to the iron p, which rod Q being suspended from the standard Q, prevents the end R of the stone from dropping and together with the rod P, suspends the stone. S, S', the Standards in which the shaft L, works, T, the crank attached to the shaft L, and to which the power is applied. Connected with the tubes C, O, are reservoirs of sand and water.

ZJ, b, are boxes in which the hollow shaft-s revolve. Z, Z, boxes in which the shaft L revolves. n, boxes in which the crank shaft revolves. i

The pulleys I, J, and N, all being belted from the shaft L, when that shaft is revolved by the power applied to the crank T, these pulleys are all set in motion, and the disks A, A, are revolved in opposite directions, and the rod P has a reciprocating movement given to it by the crank P upon the shaft of the pulley N, which reciprocating mot-ion of the rod P, moves the stone R, which is secured to it, backward and forward between the two disks, A, A', thus the disks are revolved, and the stone moves backward and forward between them, at the same time, and by a belt from the saine shaft that operates the disks or grinders. The rod Q, which aids in suspending the stone, is connected with the standard Q, in such a way as to allow the rod Q to swing backward and forward with the stone. The tubes C, O, pass through the frames to which they are attached, and are connected to the shafts B, B, by means of stuffing boxes, as seen at c, Fig. 4l, or by any other suitable devices, and the sand and water is prevented from escaping at any point of egress, except through the bore or channel of the shaft, as indicated by the arrows in Fig. 4, to the center of the disks or grinders as seen at a Fig. 4. The sand and water, passing through the shaft to the center of the disks, is thrown upon the stone from the center of the disks or grinders, and issuing between the stone and grinders at their centers, is carried by the centrifugal force of the revolving disks, all over the surfaces of the stone and disks, thus keeping them supplied with sand and water at all times. The frame of the disk A is stationary, but the disk A is moved backward and forward by the lever G, attached to the carriage D, in which the shaft B, has its bearings, and whenever it is desirable to separate the disks, the carriage D is drawn back upon the way E, and when,

as the dressing of the stone proceeds, it is necessary to bring the disks closer together, the carriage D, is moved forward. By means of the adjustable carriage and disks, stones of various degrees of thickness can be dressed and polished. By adjusting the grinders at different angles, and adjusting the frames in accordance with the taper of the cones, cones may be ground in the same manner. When only one side of a stone requires to be dressed, sand and Water is admitted upon one side only of the stone, and excluded from the other, and one of the bands is also slipped off so that only one of the disks or grinders shall revolve, by which means the stone is ground and polished upon one side only. Should both of the disks be revolved in the same direction, the centrifugal force imparted to the stone, Would give it a tendency to pass off in a tangent, but as the disks revolve reversely, this eiect of the centrifugal force of each is eounteracted so that the stone follows the motion of the crank with ease, between the grinders.

This arrangement may be applied to other similar purposes besides dressing and polishing stone.

Vhat I claim as my improvement and for Which I desire to secure Letters Patent,

The combination of the disks A, and A, attached to hollow revolving` shafts, B, and 13, With the supporting and vibrating rods P, Q, When the same are Constructed and arranged as herein described and for the purpose set forth.

DAVID HINMAN. Vitnesses J. LEONARD, WV. H. BURRIDGE. 

